Plasmonic and Photothermal Immunoassay via Enzyme-Triggered Crystal Growth on Gold Nanostars.
Anal Chem
; 91(3): 2086-2092, 2019 02 05.
Article
em En
| MEDLINE
| ID: mdl-30592404
ABSTRACT
Immunoassay is commonly used for the detection of disease biomarkers, but advanced instruments and professional operating are often needed with current techniques. The facile readout strategy for immunoassay is mainly limited to the gold nanoparticles-based colorimetric detection. Here, we show that photothermal nanoparticles can be applied for biosensing and immunoassay with temperature as readout. We develop a plasmonic and photothermal immunoassay that allows straightforward readout by color and temperature based on crystal growth, without advanced equipment. It is demonstrated that alkaline phosphatase-triggered silver deposition on the surface of gold nanostars causes a large blue shift in the localized surface plasmon resonance of the nanosensor, accompanied by photothermal conversion efficiency changes. This approach also allows dual-readout of immunoassays with high sensitivity and great accuracy for the detection of prostate-specific antigen in complex samples. Our strategy provides a promising way for point-of-care testing and may broaden the applicability of programmable nanomaterials for diagnostics.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Ensaio de Imunoadsorção Enzimática
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Técnicas Biossensoriais
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Fosfatase Alcalina
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Nanopartículas Metálicas
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Ouro
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article